In rock climbing, a hold that is really big or deep or otherwise so good that it is "bomb-proof". Can also be used of equipment that is so good as to be infalliable.
"I was climbing She Don't Use Jelly (5.10a), and I about decked five times before I got to that bomber jug on the second pitch."
by Nathan McKnight March 20, 2005
A 22oz bottle of beer (commonly used by microbreweries) or a 1.5 liter bottle of wine (also known as a magnum).
I drank an entire bomber of something called Steel Rail Extra Pale Ale once. By the end of the meal I was listing heavily to the left and serenading my parents with a very weedy rendition of "American Pie".
by connorbd@yahoo.com October 25, 2006
A very generously rolled joint, a joint that will get you really bombed, fatty
"Let's roll a bomber for the road, it's gonna be a long trip"
by public animal October 27, 2004
some one who writes graffiti
by uncle fester April 27, 2003
Rock Climbing Term meaning very safe or secure.
That anchor I just set up is bomber.

Dude, that hold is bomber.
by JPJJMF August 20, 2006
A comical toilet game. Involves sitting on top of the cubical separators of a communal toilet (most often in a public school) with your bottom aimed over the toilet bowl. You then empty your bowels from a height of 5-6 feet into the toilet. If a sufficient size log is produced the results is a massive splash down resembling a WWII navy battle.

Caution: Always employ a 'look out' before attempting.
Example:

Cleaner - "What the fuck's happened here! Someone done a bomber or what!!!"
by The Spike February 23, 2007
Refers to puffy fleece down jacket, usually of The North Face Black.
Generally it is of a black color, and is popular with youth.
Yo mang that bomber is really dope
Yeah dude I want that shit
by fj890av3 November 23, 2008